05000272/LER-1981-056-03, /03L-0:on 810521,power Partially Lost to Containment Sump Level Monitoring Sys.Caused by Design Deficiency in Unit Generator Breaker 3.Power Restored

/03L-0:on 810521,power Partially Lost to Containment Sump Level Monitoring Sys.Caused by Design Deficiency in Unit Generator Breaker 3.Power Restored

ML20005B113
Person / Time
Site:	Salem
Issue date:	06/19/1981
From:	Espey J Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20005B109	List: 05000272/LER-1981-056, Forwards LER 81-056/03L-0.Detailed Event Analysis Encl 05000272/LER-1981-056-03, /03L-0:on 810521,power Partially Lost to Containment Sump Level Monitoring Sys.Caused by Design Deficiency in Unit Generator Breaker 3.Power Restored
References
LER-81-056-03L, LER-81-56-3L, NUDOCS 8107060321
Download: ML20005B113 (1)

LER-1981-056, /03L-0:on 810521,power Partially Lost to Containment Sump Level Monitoring Sys.Caused by Design Deficiency in Unit Generator Breaker 3.Power Restored

Event date:
Report date:
2721981056R03 - NRC Website

text

U. S. NUCLE A7 REGUL ATORY COMMISSION [RC FORM 366 (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

l l

l l lh (PLE ASE PRINT OR TYPE ALL REOulT.ED INFCRMATION) 1 6

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT D ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 21, 1981, due to partial j o 12 l l Action Statement 3.4.6.lb was entered at 0836 hours0.00968 days <br />0.232 hours <br />0.00138 weeks <br />3.18098e-4 months <br /> on May l blackout causing loss of power to the Containment Sump Level Monitoring Systems for g

j o,3 ;

I o i41 l Units 1 and 2. This occurrence constituted operation in a degraded mode IAW Technical g Io isl l Specification 6.9.1.9b.

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36 37 40 41 42 43 de 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l1 l o l l Partial blackout was caused by a design deficiency in the No. 3 Unit Generator Breakerj l

l1 J 1 ) l Power was restored and the Containment Sump Level Monitoring Systems were returned to l i j 7 g l operable status. Action Statement 3.4.6.lb was terminated at 1110 hours0.0128 days <br />0.308 hours <br />0.00184 weeks <br />4.22355e-4 months <br /> on May 21, l

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l 1981. DCR-lSC-0577 has been initiated to modify the breaker protection scheme, l3 l3) l [ij,g l caution tag affixed to the breaker.

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